| (19) |
 |
|
(11) |
EP 0 832 934 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
12.08.1998 Bulletin 1998/33 |
| (43) |
Date of publication A2: |
|
01.04.1998 Bulletin 1998/14 |
| (22) |
Date of filing: 17.09.1997 |
|
| (51) |
International Patent Classification (IPC)6: C08L 83/04 |
|
| (84) |
Designated Contracting States: |
|
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
| (30) |
Priority: |
25.09.1996 US 717590
|
| (71) |
Applicant: DOW CORNING CORPORATION |
|
Midland
Michigan 48686-0994 (US) |
|
| (72) |
Inventors: |
|
- Burns, Gary Thomas
Midland,
Michigan 48642 (US)
- Reiter, Michael Robert
Midland,
Michigan 486420 (US)
|
| (74) |
Representative: Patentanwälte
Sternagel & Fleischer |
|
Braunsberger Feld 29
51429 Bergisch Gladbach
51429 Bergisch Gladbach (DE) |
|
| |
|
| (54) |
Optically clear silicone rubbers |
(57) An optically clear platinum-group metal curable silicone rubber composition having
good physical properties is disclosed. Said composition comprises a vinyldimethylsiloxy-terminated
polydimethyl(diphenyl)siloxane copolymer, comprising 1 to 20 mole percent diphenylsiloxy
units and having a viscosity of 20,000 to 100,000 mPa·s at 25
oC. and vinyldimethylsiloxy-terminated polydimethyl(diphenyl)siloxane copolymer comprising
1 to 20 mole percent of diphenylsiloxy units and having a viscosity of 50 to 10,000
mPa·s at 25
oC., and optionally comprising up to 3 mole percent of vinyldimethylsiloxy units inclusive,
a treated reinforcing silica filler and curing agents.